Military researchers have poured blood, sweat, tears and taxpayer dollars into all sorts of wacky experiments. There are plenty of reasons that they are willing to take a take a chance on just about anything.

If you have ever lost sleep thinking about what military labs the world over are cooking up to shoot up, blow up, or otherwise maim their enemies (and sometimes innocent civilians), you may want to skip the list of the world's "spookiest" weapons collected by Pop Sci. Many of the 20 we are already familiar with, like…